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© Mitsubishi Forklift Trucks 2013. All
© Mitsubishi Forklift Trucks 2013. All
CODE
CODE
31
31
37
37
38
38
52
52
rights reserved.
rights
reserved.
Revision: B
Revision: B
PBV20N2
PBV20N2
TRUCKTOOL
TRUCKTOOL
AND
AND
DISPLAY
DISPLAY
Traction motor output voltage error
Traction motor output voltage error
(high)
(high)
VMN HIGH
VMN HIGH
Cause 1:
Cause 1:
Before switching the main contactor on, the software checks the power bridge.
Before switching the main contactor on, the software checks the power bridge. It turns the low
side and high side p
side and high side power mosfets on one by one and
ower mosfets on one by one and expects the phase voltage to decrease
down to –Batt. If
down to –Batt. If the phase voltage does not decrease, this alarm occurs.
the phase voltage does not decrease, this alarm occurs.
In such a case (the main contactor does not close at all), check the f
In such a case (the main contactor does n
Motor internal connections (ohmic continuity)
Motor internal connections (ohmic continuity)
•
•
Motor power connections
Motor power connections
•
•
Motor leakage to the truck frame
Motor leakage to the truck frame
•
•
If the motor connections are OK, the
If the motor connections are OK, the problem is in the COMBIACX controller.
Cause 2:
Cause 2:
This alarm may also occur when the startup diagnosis has been completed and the main
This alarm may also occur when the startup diagnosis has been
contactor is closed. In this case, the phase voltage is expected to be lower than
contactor is closed. In this case, the phase voltage
battery voltage. If it is higher than this value, this
battery voltage. If it
is higher than this value, this alarm occurs.
In such a case (the main contactor closes and
In such a case (the main contactor closes and then opens again), check the following:
•
•
Motor connections
Motor connections
Whether the motor's phase windings or cables have leakages towards the t
Whether the motor's phase windings or cables have leakages towards the truck frame
•
•
That the main contactor closes properly, with a
That the main contactor closes properly, with a good contact
•
•
If no faults are
If no faults are found, the problem is in
found, the problem is in the COMBIACX controller.
Contactor is stuck closed
Contactor is stuck closed
CONTACTOR CLOSED
CONTACTOR CLOSED
Before driving the main contactor coil, the controller checks that the contactor is not stuck
Before driving the main contactor coil, the
(closed). The controller drives the mosfets for some milliseconds, trying to discharge the
(closed). The controller drives the mosfets for some milliseconds, trying to discharge the
capacitor bank. If the contactor is stuck, this alarm occurs.
capacitor bank. If the contactor is stuck, this alarm occurs.
In such a case, check the main contactor tips.
In such a case, check the main contactor tips. If needed, replace the main contactor.
Contactor does not close circuit
Contactor does not close circuit
CONTACTOR OPEN
CONTACTOR OPEN
This alarm occurs if the main contactor has been
This alarm occurs if the main contactor has been driven by the controller, but the
does not close.
does not close.
In such a case, check that the
In such a case, check that the wires to the main contactor coil are
disconnected.
disconnected.
The alarm can also be caused by a fault in the main contactor itself. If needed, replace the
The alarm can also be caused by a fault in the main contactor itself. If needed, replace the
contactor.
contactor.
Pump current 0A while pump running
Pump current 0A while pump running
PUMP I=0 EVER
PUMP I=0 EVER
This test is carried out when the pump motor is running, and
This test is carried out when
sensor is not constantly stuck to 0.
sensor is not constantly stuck to 0.
If this warning is displayed, check that the motor connection has continuity. If the motor
If this warning is displayed, check that t
connection is opened, the current cannot flow, so the test fails and
connection is opened, the current cannot flo
If the motor circuit is OK, the problem can be in t
If the motor circuit is OK,
the problem can be in the current sensor. In this case, replace the
COMBIACX controller.
COMBIACX controller.
https://www.forkliftpdfmanuals.com/
Document ID: 615023
Document ID: 615023
DESCRIPTION
DESCRIPTION
(Alarm)
(Alarm)
expects the phase voltage to decrease
ot close at all), check the following:
problem is in the COMBIACX controller.
is expected to be lower than 50% of the
alarm occurs.
then opens again), check the following:
good contact
the COMBIACX controller.
(Alarm)
(Alarm)
controller checks that the contactor is not stuck
If needed, replace the main contactor.
(Alarm)
(Alarm)
driven by the controller, but the contactor
wires to the main contactor coil are not interrupted or
(Warning)
(Warning)
the pump motor is running, and it verifies that the current feedback
he motor connection has continuity. If the motor
w, so the test fails and the warning is displayed.
he current sensor. In this case, replace the
157 (244)
157 (244)
Service Manual
Service
Manual
Stored
Stored
It turns the low
ollowing:
completed and the main
50% of the
ruck frame
Stored
Stored
Stored
Stored
contactor
not interrupted or
Stored
Stored
it verifies that the current feedback
the warning is displayed.
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